Secondary electric clock.



No. 88z,188. PATBNTED Mm-17, 1908 G. B. SQWELL.

SECONBARY ELECTRIC CLOCK. APPLIqATIoN FILED M1814, 1905.

UNITED STATES; PENT OFFICE-'3.

anonce 'iiNNn'ii isn'vcit, or wnsriimsrim, LoNDoNQ ENGLAND.

I SECONDARY- ELECTRIC CLOCK.

No. ssaisc.

specification oiLetters Patent.' r rammed Marh 17319013.l

Appiicauon and Decemb'erifi, 190.5. serial-N0; 291,776.

To all wm'Iri/.fit may concern: posedtherefroin; and the arbor itself is cut Bc it known that I, `(incitan BENNETT away adjacent to these pins. A wheel con-A BowE'LL, a subject ol 'the King of Great n'ected in theus'ual manner to the minute LBritain and Ireland, residing at l Palmer hand and having sixtyf4 or other suitable 60 5-st1'eet,in -the city of VeStiiiinste-r, county .number of Ateetliis'so placed as to allow of London, England, have invented certain these pins in turn to drive the wheel; the new'and useful improvements in Secondary i ,depth of-thisfconibination being such that iiilectric Clocks and the Like; land I do herethe wheel is always engaged bvoneif not I iby declare the follcwingto be afull, clear, both ofthe pins, and the armature is secured' 65 and exact descrliption of the invention, 'such' to its'arboi in sucha manner as to leave the as will enable otl'icrs skilled in the art to ltwo pins engaging the wheel in the normal which itl appertains to make and 'use the .condi-tion. In this Way the'wlieel is locked same. so that no tendency of the wheel to rotate' Vhercas considerable difficulty has hithercan then be transmitted to turn the arma- 70. to been met with in the matter of electrof ture. I i f magnetically operated secondary electric- Another electrcanagnet isv also provided clocks or such like step-by-step movements for the purpose of raising a spring or lever or owing to the jerky, action of the el'ectroequivalent device away from thetwo pins so magnets and of the faulty performance of as to'leave the armature perfectly free to be 75v 2() pawlsand ratchet-work acting upon ratchetrotated by its'iield magnet. '.lhis'spring or Wheels. Also such contrivances even when lever, upon its'controlling magnet (which I constructed to work with comparative sucwill vcall for the-purposel of distinction the 'cess vhave at best been subject toan obf flockingmagnet)ceasing to be inagnetized, jectionable degree. of .noisiness is adaptedto carry forward the armature arge l This7 my invent'on, 'relatesfto a 'new and. bor labout one-eighth of a turn and there hold improved electro-magnetic step-by-step acit in readiness for the next periodic operating tion especially suited for use as an indicator signal. .ltwill thus "be seen tha-.twhen the dial 'movement in an'electric clock system;v magnet is energized', the armature e is re- I its action is 4rendered silent 'owingr to the leasedand the time `gears are operated thereg5 total absence of pawls or click-Work and by until vthe current is broken when the owing to the comparatively slow action of Weight orspring continues' to operate said the electro-magnet-this slowness also begears in the same directionuntil the magnet. ing advantageous that it results in greater is again energized,

efficiency of the systemby increasing the 1n a modified form I may omit the lock- 90v time anddimiiiishing the rate of performing ing magnet and provide ,that the spring or the work. Moreover in my newl and iinlever above described may be operated by proved action it is possible to provide an amsome` part of the field magnet being -inade i ple margin of vpower to turn the hands -Withmovable insucli manner that upon excitaout resulting in undue wear of the parts or of tion both `.functions are effected by the 'one so 95 40 the objectionable noise of ope-ration. niodiiied magnet, or the saine magnet may For the salie of clearncss but without have an extraarmatnreapross its pole` pieces l wishing to bind myself to detail' to the exduly proportioned so asnot to'unduly handi-A clusion of modifications which would result i cap the niagnctization and attraction of the in substantially the saine arrangement l will i driving armature, or l may merely employ a 100 describe my present invention in one forni: spring acting upon a suitably shaped ain on I provide an armature which -is of a double the armature arbor so that during lthe threecain shape formed approximately by two eighth :forward movement .of the armature symmetrical eccentric portions. of circumthcspring is raised and can thus, upon cessaference and having two smaller parts of the tion oi thc signal, drive the armature for 105 circumference cutawav. This armature is ward.

pivotally mounted in the field of an electro-4 ln the accompanying illustrations, Figure magnet in such a manner that upon excita- 1 sliows'the complete inerhanis'in, and Figv tion of the magnet the armature'is turnedv shows analternative method ot constructing l through about three-eighths of a revolution. a part. i iigs. 3,A 4 ando rciliiescnt enlarged 110 55'The armature arbor is provided with two dct ail views oi the pinionand pins showingr .pinsparallel to the'axisandsyinmetrically disthe arbor cut away.

from the pinion;

ln Fig. 1 the electro-magnet comprises a pair of bobbins a a whose interior iron cores are continued in the pole pieces b b b Z2 which A embrace the armature c, also the armature d.

The armature c is mounted upon an'arbor with plnion e, meshingwith wheel f which in turn also gears with the center wheelv g.'

These parts are pivoted between the plate j andthe plate Ic, illars Z l l being provide to'su'pport the p ate 7c. The armature d, which is pivotedat h, has attached to itv the lever Vm, whose upper end is shaped as shown to engage withthe two pins n nV which project is a t banking spring, which is fixed on t e lever m.

The action of the apparatus is as follows v.Upon the electro-magnet being excited the amature d is drawn up, in the-direction of the arrow 1 and the lever m consequently moves to lthe left in the direction of the arrow 2 away from the pins n n on armature c.

Armature c, as soon as' it is thus unlocked, ro-

tates in thev direction of the larrow 3 (in Fig.v

1) on account of'its shape until it has moved fied form for carrying out myv invention, the

electro-magnet comprises a pair of bobbins a a, whose interior'iron cores are continued in the pole pieces b b at their top ends and are connected by the iron oke b at their lower ends. The pole pieces b embrace thearrnature c which is mounted upon 'an arbor with pinion e meshing with wheel f which in 1. urn also gears with the center-wheel g. These parts are pivoted between plates spaced by the pillars l l l. The pinion e has two of its opposite vleaves or pins provided longer than the others and a spring m is fixed as shown v-in such a manner as to always bring armature c into the position shown after it has been released by the breaking of the electrical. circuit at the master clock.

The action of the'apparatus is as follows "a rotary step-by-step operating device Upon the electro-magnet being excited, armature c is rotated (in the direction of the arrow 3 in Fig. 2) on account of its shape until it has moved through nearly half a revolution and presents it-s maximum diameterl to the magnetic circuit. Upon cessation of the magnetizing current the resiliennspring m which had previously been deflec led by the turning of armature c, in returning to its,

normal position completes the exact halfrevolution of armature c, and therefore holds the train of wheels in that position until the next 'periodic' working current causes a krepetition of this cycle of operations.

What I cla-iin andv desire to secure by Letters Patent is 1- 1.- In anelectric clock, .the combination of mprising an electro magnet, a double m shaped disk mounted to rotatein the field of the magnet and. actuated by the magnet when energized, means for locking said disk against actuation, means for unlocking said locking means and kadapted to bring said disk into starting position.

2. In an electric clock, the combination of a rotary step-by-step operating device comprising an electro magnet, a double camshaped disk mounted to rotate inthe field of the magnet'and actuated by the magnet when energized, a detent for locking said disk against actuation, and an armature for releasing said detent' to bring said disk into vstarting position.

3. "In an electric clock, the combination of a rotary step-by-step operating device comprising an electro magnet, a doubleI camshaped disk mounted to rotate in the field of the magnet and actuated by the magnet when energized, said disk having a inion provided with projecting pins, means or engaging said pins. to lock said 'pinion against actuation and means for releasing vsaid locking means actuated whenthe magnet ceases to be energized. I

In testimony whereof I have affixed my signature, in presence of two witnesses.

GEORGE BENNETT BOVVELL. 'Witnesse'sz F. L. RAND, H. D. JAMEsoN. 

